90418421 has 4 divisors (see below), whose sum is σ = 90577344. Its totient is φ = 90259500.

The previous prime is 90418411. The next prime is 90418439. The reversal of 90418421 is 12481409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90418421 - 2⁶ = 90418357 is a prime.

It is a super-2 number, since 2×90418421² = 16350981712266482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90418411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78605 + ... + 79746.

It is an arithmetic number, because the mean of its divisors is an integer number (22644336).

Almost surely, 2^90418421 is an apocalyptic number.

It is an amenable number.

90418421 is a deficient number, since it is larger than the sum of its proper divisors (158923).

90418421 is a wasteful number, since it uses less digits than its factorization.

90418421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158922.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 90418421 is about 9508.8601314774. The cubic root of 90418421 is about 448.8338877890.

The spelling of 90418421 in words is "ninety million, four hundred eighteen thousand, four hundred twenty-one".